Danfoss VLT series, Service Manual

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3-6
VLT is a registered Danfoss trademark
3.3 WARNING AND ALARM MESSAGES
WARNING 1
10 VOLT LOW
The 10 VDC supply on terminal 50 of the control card is too
low. Max capacity of terminal 50 is 17ma. The 10 VDC supply
on terminal 50 is supplied from a 13 volt regulator that supplies
option boards and the LCP.
This condition may be caused by overloading terminal 50 or a
short circuit in the Speed Potentiometer or related wiring.
If the 10 VDC is missing or low the most common link would
be the control card as the faulty part (after the external wiring
was removed and verified). Also see the Analog Input Test
(5.2.14.2) in Section 5.
WARNING/ALARM 2
LIVE ZERO ERROR
The current signal on terminal 60 is less than 50% of the value
programmed in parameter 315, and parameters 317 and 318
have been programmed for the time out function to be active.
It is possible to choose between a warning only or a warning
and trip based on the selection of parameter 318. Manual
reset is possible once the fault is corrected.
Faulty connection in control wiring, or faulty signal generating
device (PLC, transducer, etc.).
Check connections of control wiring. Perform the Analog Input
Test (5.2.14.2) in Section 5.
WARNING/ALARM 3
NO MOTOR
(Not applicable for the VLT 4000/6000/8000 series.)
The motor check function has been activated in parameter
122. During stop conditions the motor check is performed.
This warning will appear if the VLT fails to detect a motor.
Ensure connection between drive and motor.
WARNING/ALARM 4
AC LINE PHASE LOSS
This alarm is derived from reading the AC ripple on the DC
Bus. It is intended to indicate a missing phase on the input AC
main voltage.
One phase of the input AC line is missing or extremely low, or
severe waveform distortion is present on the input line.
Measuring the voltage and current, and verifying the wave
form of both the input AC line and the output to the motor
may be the first step to restoring proper operation of the drive.
Refer to section 5, Dynamic Test Procedures, Input Voltage
Test, Input Phase Imbalance Test, Output Phase Imbalance
Test.
See Mains Phase Loss Trips in Section 4 for more details.
WARNING 5
DC LINK VOLTAGE HIGH
The intermediate circuit voltage (DC) is above the upper warning
limit. (See ratings tables in introduction section of this manual.)
The drive is still operational.
Ramp Down time too short.
(Parameter 208 or 210 for VLT 5000, 207 for VLT 4000/6000/
8000.)
WARNING 6
DC LINK VOLTAGE LOW
The intermediate circuit voltage (DC) is below the lower warning
limit. (See ratings tables in introduction section of this manual.)
The drive is still operational.
AC line voltage too low.
Check AC input line voltage.
WARNING/ALARM 7
DC LINK OVERVOLT
The intermediate circuit voltage (DC) is above the overvoltage
limit. (See ratings tables in introduction section of this manual.)
It may be necessary to use dynamic braking. As an alternative
in the VLT 5000, the Over Voltage Control (OVC) scheme can
be activated in parameter 400. For the VLT 4000/6000/8000,
the OVC function is always active and the setting of parameters
400 and 410 have no effect on this alarm.
The voltage level detected will be displayed.
Manual reset is possible.
Warns for 5 sec.; trips after 25 sec.
Ramp Down time (Parameter 208 or 210 for VLT 5000, 207
for VLT 4000/6000/8000) significantly too short.
See Overvoltage Trips in Section 4 for more details.
WARNING/ALARM 8
DC LINK UNDERVOLT
The intermediate circuit voltage (DC) is below the under voltage
limit. (See ratings tables in introduction section of this manual.)
The unit will trip after a set period of time. On the VLT 5000
extended units with an external 24VDC supply, this message
will be displayed as long as input power is removed, however,
the unit will not trip.
The voltage level detected will be displayed. Manual reset is
possible.
AC line voltage too low for too long time.
Check AC input line voltage.
See Input Voltage Test in Section 5.